[LINUX] Study Note 9_Install Jenkins on CentOS7

★ 1 Switch the user to root and start, first check the Java version (It seems that it will not work unless Java 1.7 or higher is installed)

[root@localhost ~]# java -version
openjdk version "1.8.0_222-ea"
OpenJDK Runtime Environment (build 1.8.0_222-ea-b03)
OpenJDK 64-Bit Server VM (build 25.222-b03, mixed mode)

★ 2 Add yum repository

[root@localhost ~]# wget -O /etc/yum.repos.d/jenkins.repo http://pkg.jenkins-ci.org/redhat-stable/jenkins.repo
--2020-10-25 13:09:38--  http://pkg.jenkins-ci.org/redhat-stable/jenkins.repo
pkg.jenkins-ci.org (pkg.jenkins-ci.org)Is inquiring to DNS... 52.202.51.185
pkg.jenkins-ci.org (pkg.jenkins-ci.org)|52.202.51.185|:Connecting to 80...Connected.
Sent a connection request via HTTP, waiting for a response... 200 OK
length: 85
`/etc/yum.repos.d/jenkins.repo'Saving in

100%[===================================================================================================================================================>] 85          --.-K/s time 0s

2020-10-25 13:09:39 (5.16 MB/s) - `/etc/yum.repos.d/jenkins.repo'Save to[85/85]

★ 3 RPM public key installation

[root@localhost ~]# rpm --import https://jenkins-ci.org/redhat/jenkins-ci.org.key
[root@localhost ~]#

If it is ★ 4 ★ 3, the error "The public key of jenkins-2.249.2-1.1.noarch.rpm is not installed" will appear when installing Jenkins with yum of ★ 5 below, so import the following

[root@localhost ~]# rpm --import https://pkg.jenkins.io/redhat/jenkins.io.key
[root@localhost ~]#

★ 5 Installation of Jenkins package

[root@localhost ~]# yum -y install jenkins
Loaded plugin:fastestmirror, langpacks
Loading mirror speeds from cached hostfile
 * base: ftp.riken.jp
 * extras: ftp.riken.jp
 * updates: ftp.riken.jp
Resolving dependencies
-->Performing transaction confirmation.
--->Package jenkins.noarch 0:2.249.2-1.Install 1
-->Dependency resolution finished.

Resolved the dependency

=============================================================================================================================================================================================
Package architecture version repository capacity
=============================================================================================================================================================================================
During installation:
 jenkins                                     noarch                                     2.249.2-1.1                                        jenkins                                      64 M

Transaction summary
=============================================================================================================================================================================================
Installation 1 package

Total capacity: 64 M
Installation capacity: 64 M
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
During installation: jenkins-2.249.2-1.1.noarch                                                                                                                                   1/1
During verification: jenkins-2.249.2-1.1.noarch                                                                                                                                   1/1

Installation:
  jenkins.noarch 0:2.249.2-1.1

Has completed!
[root@localhost ~]#

★ 6 Standby port setting (Since it is 8080, change it to 8000 in consideration of collision of other services)

[root@localhost ~]# vim /etc/sysconfig/jenkins
---
JENKINS_PORT="8000"
---

★ 7 Service activation and start (enable seems to fail, but 　https://qiita.com/sawa_toru/items/d8eedef13ab66e823404 According to

[root@localhost ~]# systemctl enable jenkins
jenkins.service is not a native service, redirecting to /sbin/chkconfig.
Executing /sbin/chkconfig jenkins on
[root@localhost ~]# systemctl start jenkins
[root@localhost ~]#

★ 8 Access with "http: // localhost: 8000" in your browser Below, you will see a screen called Unlock Jenkins where you can enter the administrator password. Snap 2020-10-25 at 13.56.49.png

★ 9 Check the initial Administrator Password below and enter it on the screen of ★ 8.

[root@localhost ~]# cat /var/lib/jenkins/secrets/initialAdminPassword

★ 10 The Customer Jenkins screen will appear, so select "install suggested plugins". Snap 2020-10-25 at 14.02.35.png

★ 11 Create First Admin User Create an admin user on the screen Snap 2020-10-25 at 14.10.06.png

★ 12 After creating a user, the following screen will appear, but proceed as it is Snap 2020-10-25 at 14.12.37.png

★ 13 Continue as it is Snap 2020-10-25 at 14.13.52.png

★ 14 The welcome screen is displayed, so it is completed once. Snap 2020-10-25 at 14.15.25.png

★ 15 Referenced articles

・ Https://qiita.com/inakadegaebal/items/b526ffbdbe7ff2b443f1 ・ Https://stackoverflow.com/questions/61344317/im-getting-error-public-key-for-jenkins-2-232-1-1-noarch-rpm-is-not-installed ・ Https://weblabo.oscasierra.net/jenkins-install-centos7/ ・ Htps: // Quiita. This m / Sawa_Take / Te ms / d8 Ede f13 A b66 E 823404